The Collaborative International Dictionary of English v.0.48:
Roster \Ros"ter\, n. [Perhaps a corruption of register; or cf. roll.] (Mil.) A register or roll showing the order in which officers, enlisted men, companies, or regiments are called on to serve. [1913 Webster]WordNet (r) 3.0 (2006):
roster n 1: a list of names; "his name was struck off the rolls" [syn: roll, roster]